Many temperate insects take advantage of longer growing seasons at lower latitudes by increasing their generation number or voltinism. In some insects, development time abruptly decreases when additional generations are fit into the season. Consequently, latitudinal 'sawtooth' clines associated with shifts in voltinism are seen for phenotypes correlated with development time, like body size. Ho...

Climate change is altering geographical ranges, population dynamics and phenologies of many organisms. For ectotherms, increased ambient temperatures frequently have direct consequences for metabolic rates, activity patterns and developmental rates. Consequently, in many insect species both an earlier beginning and prolongation of seasonal duration occurred in parallel with recent global warmin...

Insect phenology consists of the timing life events, as well number generations (voltinism). While several studies have focused on impact climate seasonal or voltinism single species, we few insights into factors that shape patterns within ecological communities. Importantly, can a major population growth, species interactions, and rate evolution. We investigated relative importance spatial var...

We develop individual-based Monte Carlo methods to explore how climate change can alter insect voltinism under varying greenhouse gas emissions scenarios by using input distributions of diapause termination or spring emergence, development rate, and diapause initiation, linked to daily temperature and photoperiod. We show concurrence of these projections with a field dataset, and then explore ...

Watershed-scale anthropogenic stressors have profound effects on aquatic communities. Although several functional traits of stream macroinvertebrates change predictably in response to land development and urbanization, little is known about macroinvertebrate functional responses in lakes. We assessed functional community structure, functional diversity (Rao's quadratic entropy) and voltinism in...

A major issue for the proper understanding of the evolution of life-cycle histories is the regulation of voltinism and its variation. Diapause characteristics are known to regulate voltinism, but the underlying mechanisms are poorly understood. This paper studies diapause duration and voltinism variation in a haematophagous diptera parasitizing 2 sympatric hosts with very different breeding phe...

Field studies over 3 yr demonstrated that overwintering populations of the Colorado potato beetle in upstate New York and on Long Island are composed of adults from both the first and second summer generations. The two populations from the climatically different regions differ in their responses to environmental factors that influence voltinism. The critical photoperiod for aestival diapause in...

A change in climate is known to affect seasonal timing (phenology) of the life stages of poikilothermic organisms whose development depends on temperature. Less understood is the potential for even greater disruption to the life cycle when a phenology shift exposes photoperiod-sensitive life stages to new day lengths. We present a conceptual framework and model to investigate the ways that phot...

Recent hot droughts in California resulted ponderosa pine (Pinus ponderosa) mortality attributed to drought and western beetle (WPB, Dendroctonus brevicomis). While alone can cause tree death, direct warming effects on WPB are a contributing factor. Research generation timing (voltinism), however, is lacking. We monitored attacks adult emergence at two sites developed degree-day model from fiel...

lobesia botrana (denis & schiffermüller) (lepidoptera: tortricidae), is an important vineyard-pest in the european and mediterranean areas and it was recently described in argentina and chile. since knowledge on the l. botrana phenology on argentina is still limited, the objective of this study was to develop a phenological model to predict voltinism of l. botrana in argentina through a reg...